Given that , express in terms of

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- January 9th 2010, 11:46 PMPunchCan't start
Given that , express in terms of

- January 9th 2010, 11:59 PMSudharaka
Dear Punch,

Given the above relations I think you should be able to express TanA interms of TanB. - January 10th 2010, 12:01 AMProve It
- January 10th 2010, 12:04 AMPunch
Thanks Prove it.. i feel so grateful to you

I have another question,

Given that cos x = p, express sin4x in terms of p - January 10th 2010, 12:09 AMSudharaka
Dear Punch,

By substituting Cosx=p and further simplification will give you the answer.

Hope this helps. - January 10th 2010, 12:14 AMPunch
- January 10th 2010, 12:16 AMProve It
- January 10th 2010, 12:20 AMSudharaka
Dear Punch,

Do you know that,

These are the two equations I used. In case you do not know them I think you should refer List of trigonometric identities - Wikipedia, the free encyclopedia When going from 3 to 4 I used the second identity.

Hope this helps. - January 10th 2010, 12:33 AMPunch
got it! thanks!

- January 10th 2010, 06:34 AMGrandad